Improvement in safety attachments for elevators



R. H. HILL. Safety Attachment for Elevators.

No. 210,693. Patented Dec. 10,1878,

INVENTOR ATTORNEYS WITNESSES MFEEFIB. PROTQ-DTHOGFLEPHER, WASHINGYON, DC.

UNITED STATES PA'I'EQ RICHARD H. HILL, OF NEW HAVEN, CONNECTICUT.

IMPROVEMENT lN SAFETY ATTACHMENTS FOR ELEVATORS.

Specification forming part of Letters Patent No. 210,693, dated December10,1878; application filed July 23, 1 878.

To all whom it may concern:

Be it known that I, Brennan H. HILL, of New Haven, in the county of NewHaven and State of Connecticut, have invented a new and usefulImprovement in Safety Attachments for Elevators, of which the followingis a specification:

Figure l is a front view of myimproved attachment, shown as applied tothe ways, the carriage, and the safety-bar of an elevator. Fig. 2 is avertical section of the same, taken through the line or x, 1. Fig. 3 isa detail view, showing the rack and pawlof the safetybar.

Similar letters of reference indicate corresponding parts.

The invention will first be described in connection with the drawings,and then pointed out in the claim.

A represents the ways of the elevator, upon which the carriage B movesup and down.

To the ways A are attached the racks C, with which the outer ends of thelever-pawls D engage. The pawls D are slotted to receive the pins bywhich. they are pivoted to the carriage B, to give them the necessaryplay.

The inner ends of the pawls D are pivoted to the ends of the safetybarE, which is placed beneath the cross-bar of the carriage, and betweenwhich and the said cross-bar is interposeda spring, I so that the saidsafety-bar may be thrown down, when released, by its own weight, and bythe elasticity of the spring F, causing it to act promptly in projectingthe pawls D and stopping the descent of the carriage.

The safetybar E is held up, holding the pawls D away from the racks C,by the latch G, one end of which is hinged to an arm, H, attached to thecross-bar of the carriage 13, and its other end rests upon the hookformed upon the end of the bent lever I. The lever I is bent at rightangles, and is pivoted, at or near its angle, to supports attached tothe cross-bar of the carriage B.

The outer end of the lever I rests upon the end of the lever J, which isbent twice at right angles, or nearly at right angles, and is pivoted atits upper angle to the outer end of an arm, K, attached to the crossbarof the carriage 13.

Upon the other end of the lever J rests the lower end of the spindle L,which passes up through the bevel-gear wheel M, and its upper end worksin hearings in an arm, N, at tached to the cross-bar of the carriage B.

In the upper part of the spindleL is formed a ring-groove to receive theupper ends of the levers O, which are pivoted to the upper part of thebevel-gear wheel M, and to the lower ends of which are attached thegovernor-balls P.

The teeth of the bevel-gear wheel M mesh into the teeth of thebevel-gear wheel Q, attached to the inner end of the short shaft It,which revolves in bearings attached to the carriage B, and to its outerend is attached the pulley S, around which passes aturn of the rope T.

The ends of the rope T are attached to the upper and lower parts of theway A.

If desired, the pulley S and rope T may be replaced by a gear-wheel, U,and rack V, in which case the gear-wheel U is attached to the outer endof the shaft R; and the rack V, into the teeth of which the teeth of thesaid gear-wheel U mesh, is attached to the ways A.

\Vith this construction, as the elevator-carriage moves up and down atordinary speed the balls 1? remain in their normal position; but shouldthe speed increase so as to become dangerous, the balls P will be thrownout ward, causing the levers O to force the spindle L downward, whichmovement operates the levers J I, releases the latch C, and allows thesafety-bar E to drop, throwing the lever-pawls D into gear with theracks C, and stopping the descent of the carriage B.

I am aware that it is not new to use pawls in the base of platform andconnected with the lifting-rope, or to release pawls by the operation ofa governor upon a tripping device; but these necessitate thediseonnection of hoisting-rope and pawls before the latter can beoperated. I What I claim as new and of my invention is- The combination,with the way-frame A, having the fixed racks C, of a carriage, B,provided with slotted pivoted pawls D, the latch-arm G, and the arm K,the levers I J, and the sliding governor-spindle L, all arrangedsubstantially as and for the purpose specified.

RICHARD H. HILL.

Witnesses G130. 13. \VALTON, JULIUS Twrss.

